$2\left(x+5\right)-7$
$\frac{2x-6}{4}=5$
$\frac{x}{3}<20$
$\frac{729-512b^{3}}{9-8b}$
$x'-0.5x=t^2$
$18+9+9x-3+5x$
$2x+15=-7$
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